gcc/testsuite/go.test/test/bugs/bug260.go

   1 // $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug260 failed
   2
   3 // Test that structures pack densely, according to the alignment of the largest field.
   4
   5 package main
   6
   7 import (
   8         "fmt"
   9         "os"
  10         "strconv"
  11 )
  12
  13 type T1 struct { x uint8 }
  14 type T2 struct { x uint16 }
  15 type T4 struct { x uint32 }
  16
  17 func main() {
  18         report := len(os.Args) > 1
  19         status := 0
  20         var b1 [10]T1
  21         a0, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[0])[2:], 16)
  22         a1, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[1])[2:], 16)
  23         if a1 != a0 + 1 {
  24                 fmt.Println("FAIL")
  25                 if report {
  26                         fmt.Println("alignment should be 1, is", a1-a0)
  27                 }
  28                 status = 1
  29         }
  30         var b2 [10]T2
  31         a0, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[0])[2:], 16)
  32         a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[1])[2:], 16)
  33         if a1 != a0 + 2 {
  34                 if status == 0 {
  35                         fmt.Println("FAIL")
  36                         status = 1
  37                 }
  38                 if report {
  39                         fmt.Println("alignment should be 2, is", a1-a0)
  40                 }
  41         }
  42         var b4 [10]T4
  43         a0, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[0])[2:], 16)
  44         a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[1])[2:], 16)
  45         if a1 != a0 + 4 {
  46                 if status == 0 {
  47                         fmt.Println("FAIL")
  48                         status = 1
  49                 }
  50                 if report {
  51                         fmt.Println("alignment should be 4, is", a1-a0)
  52                 }
  53         }
  54         os.Exit(status)
  55 }